Portable battery



FIG. 1 is a front view of a portable battery showing our new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is an end view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a bottom perspective view thereof;

FIG. 8 is a top perspective view thereof;

FIG. 9 is a side perspective view thereof; and,

FIG. 10 is an end perspective view thereof.

CLAIM The ornamental design for a portable battery, as shown anddescribed.